This is one of the best sellers in hand tool sets. The well-balanced tri-driver system contains most tools that mechanics ever needed. 1/4, 3/8, and 1/2 72 teeth ratchet wrenches with quick release button provide handiness for all kinds of fastening jobs. Comprehensive socket sizes ranging from 4mm to 32mm and assorted bits and bit sockets equip its users with right tools for impeccable precision and superior efficiency. Furthermore, a magnetic spinner handle, 4 extension bars, 2 T-bars, 3 universal joints, 3 couplers, 7 hex keys, and 3 spark plug sockets are all included in a heavy-duty PE-HD blow mold case to ensure tidiness and accessibility for the users.